Advice from Mark Dever (originally found here) on what to do before you leave a church and if you leave a church. Good advice that is rarely followed. (I may have listed some of these before, but saw them again at Challies.)

Before You Decide to Leave

Pray.

Let your current pastor know about your thinking before you move to another church or make your decision to relocate to another city. Ask for his counsel.

Weigh your motives. Is your desire to leave because of sinful, personal conflict or disappointment? If it’s because of doctrinal reasons, are these doctrinal issues significant?

Do everything within your power to reconcile any broken relationships.

Be sure to consider all the “evidences of grace” you’ve seen in the church’s life—places where God’s work is evident. If you cannot see any evidences of God’s grace, you might want to examine your own heart once more (Matt. 7:3-5).

Be humble. Recognize you don’t have all the facts and assess people and circumstances charitably (give them the benefit of the doubt).

If You Go

Don’t divide the body.

Take the utmost care not to sow discontent even among your closest friends. Remember, you don’t want anything to hinder their growth in grace in this church. Deny any desire to gossip (sometimes referred to as “venting” or “saying how you feel”).

Pray for and bless the congregation and its leadership. Look for ways of doing this practically.